Well in general it should work like that:
- open a terminal
- Install the firmware:
pamac build broadcom-bt-firmware-git
- remove/unload the current driver:
sudo modprobe -rfv btusb
- add/load it again:
sudo modprobe -v btusb
- Check if it is running without errors:
sudo dmesg | grep -i blue
- Configure bluetooth configs:
hciconfig --all
I did not test that and have no bluetooth devices for testing.